If any exception occurs in critical section code then what sort of issue which we see in terms of synchronization objects?
Before and after the critical section code, Mutex is locked and unlocked. But if any exception occurs then the waiting thread will be waiting for resource to be freed as Mutex is not unlocked due to the exception.
I am using a thread in my application .. A DLL is written for In and Out instructions for hardware ICS and to read FIFO.
My code is
CCriticalSection crdll , crsec ;
UINT ThreadReceiveData(LPVOID param) {
for ( ; ; ) {
if (bTerminate) break; // bTerminate = 1 in Doc template destructor
crdll.Lock();
[Code] ....
I am confused , how and when I should use Ctitical Section ? The program works fine but I am not happy as this is main routine of the program and I have not understood it properly.
I am facing an issue with re entrance of one of my dll module. I had MLClient.dll which load in to program using LoadLibrary(MLClient.dll)
boost:: shared_ptr will add a lock() on this Load & initialization of library.
Due some of my requirements I want to un initialize this library and unload.?
How can i do the same with windows functions.?
How can i leave the lock on library using boost::shared_ptr.?
un load if there is a lock() on it ?
I want to know how mutex is working in process synchronization. Where these mutexes are stored in memory how another process know about this mutex?
If two different mutexes are having same name what will happen?
I've verified this on ubuntu 12.10 and on windows/mingw, and found that g++ version 4.7.2 seems to have broken thread/mutex support.
View 11 Replies View RelatedI was trying to put mutex lock on shared memory but my code is not working. What I want is that if some process is putting something on shared memory segment, other process should not be able to access that segment. For testing , I create a server program which put data in shared memory and client program which access the data.
To test it, I put break point after:
pthread_mutex_lock(&(init_lock));
But I see that client program was able to access shared memory.
Below is code:
Server: Code: pthread_mutex_t init_lock = PTHREAD_MUTEX_INITIALIZER;
main()
{
char c;
[Code].....
I am trying to make a random number generator to simulate a critical hit if the number generated is from 0-critical amount. However, every time i run the code, despite being within the parameters set by the if statements, it always runs through as a critical hit and never a regular hit.
#include <iostream>
#include <iomanip>
#include <ctime>
#include <cstdlib>
using namespace std;
int main(){
srand((unsigned)time(0));
[Code]...
There are four attempts to save time in getting a good result.
Consider how to implement a mutex lock using an atomic hardware instruction. Assume that the following structure defining the mutex lock is available:
Code:
typedef struct {
int available;
}
lock; (available == 0)
indicates that the lock is available, and a value of 1 indicates that the lock is unavailable. Using this struct, illustrate how the following functions can be implemented using the test and set() and compare and swap() instructions:
void acquire(lock *mutex)
void release(lock *mutex)
Be sure to include any initialization that may be necessary.
I'm trying to use semaphores on three different processes so that each process won't enter the critical region at the same time and also go in the order: process 1 -> process 2 -> process 3. However, everytime i run the code the process 3 keeps going before process 2.
Here's my code:
#include <stdio.h>
#include <sys/types.h>
#include <sys/ipc.h>
[Code].....
the processes should print out like this:
process 1: 100000
process 2: 300000
process 3: 600000
I want to have my program only clear a section of the lines displayed on screen. For example if:
Welcome. Enter : (cin)
Choose a mode: (cin)
(etc...)
Clear above lines (for example) 1 and 2?: (cin)
//now I want the program to do that. How?
Overall, I want to be able to system ("cls") only certain lines.
Im problem with parsing. I read file line by line and i store another class bu when i parse the line last word gone example "I study algebra and discrite math" math didnt store.Why ? i want to calculate index section for document how can i solve this problem??
Code:
void DocumentIndex::parse(){
size_t pos = 0; //position
pos =line.find(" ");
while( ( pos = line.find(" ") ) != std::string::npos )
{
[code]....
I am having trouble with the implementation section of my code. The trouble I am having is with the """"string Name::RevereUsingString()""" function/method. I keep getting an error saying that """"control reaches end of non-void function"""". The two void function below the ""string Name::RevereUsingString()"" fuction/method are ok and ready to be worked on.
How to implement the ""string Name::RevereUsingString()"" correctly in the implementation section?
#include <iostream>
#include <string>
using namespace std;
//-------------Class Section------------------------------------
class Name {
[Code] .....
I'm trying to create a piece of code similar to the code I have created on the new username section which will allow me to put certain restrictions on how my new users log in i.e the password length and the the need for a numeric digit. I also need storing my new members details in my previously created array.
case 'N': //Set up new user
Console.Write("
Create new Member details
");
Console.Write("
Create new Username
must be 8 characters, all letters, 1 Capital letter");
[Code] ....
The program is showing zero in output section ....
Code:
#include <iostream>
#include <cstdio>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;
const int SZ = 55;
[Code] ....
The output:
Code:
First Last Employee Hours Rate Regular Overtime Gross
Name Name Number Worked of Pay Pay Pay Pay
==============================================================
Jane Adams A1234 40.00 10.00 0.00 0.00 0.00
Mary Lincoln L8765 50.00 10.00 0.00 0.00 0.00
Martha Washington W7654 25.50 10.85 0.00 0.00 0.00
John Adams A9876 52.00 15.75 0.00 0.00 0.00
George Washington W1235 45.00 25.00 0.00 0.00 0.00
Abraham Lincoln L9087 40.25 55.00 0.00 0.00 0.00
William Tell T9876 30.00 9.75 0.00 0.00 0.00